The problem with TP is the level of of vibration from teh engines. And the longer the fuselages are the stronger the level of vibration.Of course, there is now active damping such as in teh ATR and Q400. However, with bigger turboprop, the problem would be serious (think at the Tu95 crew).

Prop fan have never reached the market simply because the market can’t regulate itself for teh next 40 years in term of emissions just like noticed by a RR manager lately (I have to found the link alrdy posted somewhere). And it is more easy to improve an enclosed system than an open fan. But the tech is ready.

I have also noticed on the Mil thread a number of R&D project at long term toward the renewal of propfan studies through new tech in Russia. Maybe this will reach the civil market at one time or another.